So... you believe Stalin and the Soviet leadership were greedy for money and power. Why did they bother with the country's industrialization then? They could've kept the financial resources for themselves. Why did they improve education and increase the Soviet people's literacy? It would be a lot easier to manipulate and brainwash a herd of uneducated peasants, don't you think?
USSR becoming a superpower does not excuse the mass murders that happened, it explains why they happened. I would like to remind you the "democratic and peaceful leader of the world", whose values you defend, The United States of America were found on the basis of the genocide of indigenous people. A fact that is rarely discussed and a lot of people seem to be forgetting.
The point of my rambling is - you tried to defend your Western political beliefs and prove communism is bad and ineffective by giving Stalin and the USSR as a historic example, but you have yet to explain why your example is valid. If you believe the USSR could have recovered from the Great War, the civil war and then endure World War 2 successfully, through Western political and economical approach without the inhumane acts you mentioned, prove it.